Replace acpi_bus_get_device() that is going to be dropped with
acpi_fetch_acpi_dev().

No intentional functional impact.
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Link: https://lore.kernel.org/r/11918902.O9o76ZdvQC@kreacher
Link: https://lore.kernel.org/r/11920660.O9o76ZdvQC@kreacherSigned-off-by: Jakub Kicinski <kuba@kernel.org>